CN109000418B - Thawing device and refrigerator with same - Google Patents
Thawing device and refrigerator with same Download PDFInfo
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- CN109000418B CN109000418B CN201710418990.4A CN201710418990A CN109000418B CN 109000418 B CN109000418 B CN 109000418B CN 201710418990 A CN201710418990 A CN 201710418990A CN 109000418 B CN109000418 B CN 109000418B
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- thawing
- unfreezing
- radio frequency
- chamber
- generation module
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/12—Arrangements of compartments additional to cooling compartments; Combinations of refrigerators with other equipment, e.g. stove
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/46—Dielectric heating
- H05B6/62—Apparatus for specific applications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
Abstract
The invention provides a thawing device. This thawing apparatus includes: a barrel defining a thawing chamber having a forward opening for placing an object to be treated; the device door body is arranged at the front opening of the unfreezing chamber and used for opening and closing the unfreezing chamber; a radio frequency generation module configured to generate a radio frequency signal; the upper electrode plate and the lower electrode plate are respectively and horizontally arranged on the top wall and the bottom wall of the unfreezing chamber and are respectively and electrically connected with the radio frequency generating module so as to generate radio frequency waves with corresponding frequency in the unfreezing chamber according to radio frequency signals and unfreeze objects to be processed in the unfreezing chamber; and an input terminal configured to be electrically connected to the radio frequency generation module to receive external power. The unfreezing device is provided with the input terminal which can be connected with an external power supply and is used for receiving electric energy, so that the unfreezing device is modularized, is convenient to manage and use, and improves user experience.
Description
Technical Field
The invention relates to the field of unfreezing, in particular to a unfreezing device and a refrigerator with the same.
Background
During the freezing process, the quality of the food is maintained, however, the frozen food needs to be thawed before processing or consumption. In order to facilitate a user to freeze and thaw food, the related art generally defrosts the food by providing a heating device or a microwave device in a refrigerator.
However, the heating device generally needs a long thawing time to thaw food, and the thawing time and temperature are not easy to be controlled, so that water evaporation and juice loss of the food are easily caused, and the quality of the food is lost; the microwave device is used for unfreezing food, the speed is high, the efficiency is high, the loss of nutrient components of the food is low, but the penetration and the absorption of microwaves to water and ice are different, the distribution of internal substances of the food is not uniform, the energy absorbed by a melted area is large, and the problems of uneven unfreezing and local overheating are easily caused. In view of the above, there is a need for a thawing apparatus and a refrigerator having high thawing efficiency, uniform thawing, and guaranteed food quality.
Disclosure of Invention
It is an object of the first aspect of the invention to provide a thawing apparatus which is easy to use.
It is a further object of the first aspect of the invention to avoid excessive thawing of the object to be treated.
An object of the second aspect of the present invention is to provide a refrigerator having the thawing apparatus.
In particular, according to a first aspect of the present invention, there is provided a thawing apparatus comprising:
a barrel defining a thawing chamber therein having a forward opening for placing an object to be treated;
the device door body is arranged at the front opening of the unfreezing chamber and used for opening and closing the unfreezing chamber;
a radio frequency generation module configured to generate a radio frequency signal;
the upper electrode plate and the lower electrode plate are respectively horizontally arranged on the top wall and the bottom wall of the unfreezing chamber and are respectively electrically connected with the radio frequency generating module so as to generate radio frequency waves with corresponding frequencies in the unfreezing chamber according to the radio frequency signals and unfreeze the object to be processed in the unfreezing chamber; and
and the input terminal is electrically connected with the radio frequency generation module so as to receive external electric energy.
Optionally, the thawing apparatus further comprises:
and the detection module is configured to detect an incident wave signal and a reflected wave signal of an electric connection line connecting the radio frequency generation module and the upper electrode plate, and calculate the load impedance of the radio frequency generation module according to the voltage and the current of the incident wave signal and the voltage and the current of the reflected wave signal.
Optionally, the thawing apparatus further comprises:
the load compensation module is configured to controllably increase or decrease the load impedance of the radio frequency generation module and enable the difference between the load impedance and the output impedance of the radio frequency generation module to be greater than or equal to a first impedance threshold value and less than or equal to a second impedance threshold value so as to improve the thawing efficiency of the object to be treated.
Optionally, the cartridge further comprises:
the radio frequency generation module is arranged between the vertical partition plate and the rear plate of the barrel; and
the horizontal partition plate is arranged to extend forwards from the vertical partition plate along the horizontal direction, and the detection module and the load compensation module are arranged between the horizontal partition plate and the top plate of the cylinder.
Optionally, a device air inlet is formed in the rear plate of the cylinder, and a thawing air inlet is formed in the vertical partition plate, so that air outside the thawing device enters the thawing chamber through the device air inlet and the thawing air inlet; and is
And the side plates at the two transverse sides of the unfreezing cavity are provided with device air outlets, so that the gas in the unfreezing cavity is discharged out of the unfreezing device through the device air outlets.
Optionally, the detection module is configured to further calculate a change rate of the dielectric coefficient of the object to be processed according to the load impedance of the radio frequency generation module, so as to determine the thawing progress of the object to be processed; and is
The radio frequency generation module is configured to:
when the change rate of the dielectric coefficient of the object to be treated is greater than or equal to a first rate threshold value, the working power of the object to be treated is reduced by 30-40% so as to prevent the object to be treated from being excessively thawed; and/or
And stopping working when the change rate of the dielectric coefficient of the object to be processed is reduced to be less than or equal to a second rate threshold value.
Optionally, the thawing apparatus further comprises:
the unfreezing switch is arranged on the device door body and is used for controlling the starting and stopping of a unfreezing program; and the radio frequency generation module is configured to:
when the unfreezing switch is turned on, the work is started;
and when the defrosting switch is closed, the defrosting switch stops working.
Optionally, the cylinder and the device door body are respectively provided with electromagnetic shielding features; and is
The electromagnetic shielding characteristic of the cylinder and the electromagnetic shielding characteristic of the door body of the device are set to be in conductive contact, so that when the door body of the device is closed, the radio frequency waves generated by the unfreezing device are prevented from leaking outside the unfreezing device.
Optionally, the radio frequency signal is a fixed frequency preset in a range of 40-42 MHz.
According to a second aspect of the present invention, there is provided a refrigerator comprising a cabinet defining at least one accommodating space, compartment doors for opening and closing the at least one accommodating space, respectively, and a thawing device as described in any one of the above, the thawing device being provided in one of the accommodating spaces; wherein
The containing space provided with the thawing device is provided with an output terminal, and the input terminal is arranged to be in butt joint with the output terminal so as to supply power to the thawing device.
The unfreezing device is provided with the input terminal which can be connected with an external power supply and is used for receiving electric energy, so that the unfreezing device is modularized, is convenient to manage and use, and improves user experience.
Furthermore, the invention judges the thawing progress of the object to be treated by calculating the change rate of the dielectric coefficient of the object to be treated through the detection module. Prior to the present invention, it was generally believed by those skilled in the art that when the temperature of the treatment was high (i.e., the temperature of the treatment was-7℃. or higher), the thermal effects would be significantly attenuated and the treatment would not be excessively thawed. However, this is not the case, and the rf thawing power is usually large, for example, greater than 100W, and when the temperature of the object to be treated is already high, the object to be treated is easily over-thawed. The inventor of the application creatively realizes that when the temperature of the object to be treated is higher, the working power of the radio frequency generation module is reduced by 30-40%, and the object to be treated can be effectively prevented from being excessively thawed. Furthermore, the invention judges whether the unfreezing is finished or not according to the change rate of the dielectric coefficient of the object to be treated, compared with the prior art that whether the unfreezing is finished or not is judged by sensing the temperature of the object to be treated, the judgment is more accurate, the object to be treated can be further prevented from being excessively unfrozen, and tests show that the object to be treated unfrozen by the unfreezing device has the temperature of-4 to-2 ℃ generally when the unfreezing is finished, and the generation of blood water during unfreezing when the object to be treated is meat can be avoided.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic block diagram of a thawing apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along section line A-A in FIG. 1;
FIG. 3 is a schematic block diagram of the defrosting apparatus of FIG. 1 with the apparatus door removed to show the internal structure of the defrosting apparatus;
FIG. 4 is a graph of the rate of change of the dielectric constant of an object to be treated according to one embodiment of the present invention;
FIG. 5 is a schematic structural view of a refrigerator according to one embodiment of the present invention, in which all outer door bodies of the refrigerator are removed to show a compartment structure inside a cabinet of the refrigerator;
FIG. 6 is a schematic cross-sectional view of the refrigerator shown in FIG. 5;
FIG. 7 is a schematic block diagram of the compressor compartment of FIG. 6;
fig. 8 is a flowchart of a thawing method for a refrigerator according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic structural view of a thawing apparatus 100 according to an embodiment of the present invention. Referring to fig. 1, the thawing apparatus 100 may include a barrel 110, an apparatus door 120, a radio frequency generation module 130, and upper and lower electrode plates 140a and 140 b. The bowl 110 may include a top plate, a bottom plate, a rear plate, and two opposing lateral side plates, and may define a thawing chamber 114 therein having a forward opening, the thawing chamber 114 being used for placing an object to be treated. The door 120 may be disposed at a forward opening of the thawing chamber 114 for opening or closing the thawing chamber 114. The device door 120 may be installed with the cartridge 110 by an appropriate method, such as a left-handed door, a right-handed door, an up-handed door, or a pull-out door. The RF generation module 130 may be configured to generate RF signals (generally referred to as RF signals having a frequency of 300KHz to 300 GHz). The upper electrode plate 140a and the lower electrode plate 140b may be horizontally disposed at the top wall and the bottom wall of the thawing chamber 114, respectively, and are electrically connected to the rf generating module 130, respectively, so as to generate rf waves with corresponding parameters in the thawing chamber 114 according to the rf signals generated by the rf generating module 130, and to thaw the object to be processed placed in the thawing chamber 114. In the present invention, the upper electrode plate 140a is a transmitting antenna; the lower electrode plate 140b is a receiving antenna. In some embodiments, 50 ohm electrical connections may be used to electrically connect the upper electrode plate 140a and the lower electrode plate 140b, respectively, to the rf generation module 130.
In particular, the thawing apparatus 100 may further include an input terminal 131, such as a USB terminal, a SCSI terminal, or the like. The input terminal 131 may be configured to be electrically connected to the rf generation module 130 to receive external power to power the rf generation module 130. The thawing device 100 of the present invention is provided with the input terminal 131 which can be connected with an external power supply and receives power for the thawing device 100, so that the thawing device is modularized, convenient to manage and use, and improves user experience.
In some embodiments, the thawing apparatus 100 may further comprise a detection module 150. The detection module 150 may be configured to detect an incident wave signal and a reflected wave signal of an electrical connection connecting the rf generation module 130 and the upper electrode plate, and calculate a load impedance of the rf generation module 130 based on a voltage and a current of the incident wave signal and a voltage and a current of the reflected wave signal. The calculation formula of the load impedance is as follows:
SWR＝Z2/Z1(1)
Z1＝U1/I1＝R1+jX1(2)
Z2＝U2/I2＝R2+jX2(3)
in equations (1), (2), (3): SWR is standing wave ratio; z1Is the output impedance; z2Is the load impedance; u shape1Is the incident wave voltage; i is1Is incident wave current; r1Is an output resistor; x1Is an output reactance; u shape2Is the reflected wave voltage; i is2Is a reflected wave current; r2Is a load resistor; x2Is a load reactance (as will be understood by those skilled in the art, the output impedance is the impedance of the electrical connection connecting the rf generating module 130 and the upper electrode plate 140a, and the load impedance is the impedance of the object to be processed).
The thawing apparatus 100 may further include a load compensation module 160. The load compensation module 160 may include a compensation unit and a motor for adjusting an impedance of the compensation unit. The compensation unit may be disposed in series with the object to be processed, i.e., when the load impedance of the rf generation module 130 is the sum of the impedance of the object to be processed and the impedance of the compensation unit. The motor may be configured to controllably increase or decrease the impedance of the compensation unit, and thus the load impedance Z of the rf generation module 1302And makes the load impedance Z of the RF generation module 1302And an output impedance Z1Difference (i.e. load impedance Z)2Subtracting the output impedance Z1The obtained value) is more than or equal to a first impedance threshold value and less than or equal to a second impedance threshold value, and the first impedance threshold value is less than the second impedance threshold value, so as to improve the thawing efficiency of the object to be treated. In some preferred embodiments, the first impedance threshold is the output impedance Z1Is-6 to-4%, and the second impedance threshold is the output impedance Z14-6% of the total. Further preferably, the first impedance threshold is the output impedance Z1Of the second impedance threshold is the output impedance Z15% of the total.
The detection module 150 may be configured to further determine the load impedance Z of the RF generation module 1302And calculating the dielectric coefficient of the object to be treated and the change rate of the dielectric coefficient so as to judge the thawing progress of the object to be treated. The dielectric coefficient of the object to be processed is calculated by the following formula:
X2＝1/2πfC (4)
ε＝4πKdC/S (5)
in equations (4), (5): f is the frequency of the radio frequency wave; c is the capacitance of the capacitor formed by the upper electrode plate 140a and the lower electrode plate 140 b; epsilon is the dielectric coefficient of the object to be treated; k is an electrostatic constant; d is the thickness of the upper electrode plate; and S is the area of the upper electrode plate.
The rate of change of the permittivity of the object to be treated can be obtained by calculating the value of change Δ ∈ of the permittivity within a unit time Δ t, which may be 0.1 second to 1 second, for example, 0.1 second, 0.5 second, or 1 second. FIG. 4 is a graph showing a rate of change of permittivity of an object to be treated according to an embodiment of the present invention (ordinate: rate of change of permittivity of the object Δ ε/Δ t; abscissa: thawing time t of the object in min). Referring to fig. 4, in some preferred embodiments, the rf generation module 130 may be configured to reduce the operating power by 30% -40%, for example, 30%, 35% or 40%, when the change rate Δ ∈/Δ t of the dielectric coefficient of the object to be processed is greater than or equal to the first rate threshold, so as to prevent the object to be processed from being excessively thawed (as will be understood by those skilled in the art, the excessively thawed object is greater than 0 ℃). The first rate threshold may be 15-20, such as 15, 17, 18, or 20. The RF generation module 130 can be further configured to stop operating when the rate of change of the permittivity Δ ε/Δ t of the object to be treated drops to less than or equal to a second rate threshold. The second rate threshold may be 1-2, such as 1, 1.5, or 2.
It is known to those skilled in the art that the dielectric constant of the object to be treated may vary with the temperature of the object to be treated, however, the dielectric constant is usually measured by a special instrument (such as a dielectric constant tester), and the special instrument occupies a large space and is high in cost, and is not suitable for a thawing apparatus with a small size. The dielectric coefficient of the object to be processed is obtained by detecting the incident wave signal and the reflected wave signal of the electric connecting line connecting the radio frequency generation module 130 and the upper electrode plate and calculating, so that the invention has small occupied space and low cost and is particularly suitable for a thawing device. According to the invention, the difference between the load impedance and the output impedance of the radio frequency generation module 130 is within a preset range (greater than or equal to a first impedance threshold and less than or equal to a second impedance threshold) through the load compensation module 160, so that the thawing efficiency of the object to be treated is improved.
Further, the invention judges the thawing progress of the object to be treated by calculating the change rate of the dielectric coefficient of the object to be treated through the detection module 150. Prior to the present invention, it was generally believed by those skilled in the art that when the temperature of the treatment was high (i.e., the temperature of the treatment was-7℃. or higher), the thermal effects would be significantly attenuated and the treatment would not be excessively thawed. However, this is not the case, and the rf thawing power is usually large, for example, greater than 100W, and when the temperature of the object to be treated is already high, the object to be treated is easily over-thawed. The inventor of the present application has creatively recognized that, when the temperature of the object to be treated is high, the operating power of the rf generating module 130 is reduced by 30-40%, which can effectively prevent the object to be treated from being excessively thawed. Furthermore, the invention judges whether the unfreezing is finished or not according to the change rate of the dielectric coefficient of the object to be treated, compared with the prior art that whether the unfreezing is finished or not is judged by sensing the temperature of the object to be treated, the judgment is more accurate, the object to be treated can be further prevented from being excessively unfrozen, and tests show that the object to be treated unfrozen by the unfreezing device has the temperature of-4 to-2 ℃ generally when the unfreezing is finished, and the generation of blood water during unfreezing when the object to be treated is meat can be avoided.
In some embodiments, the door 120 may be provided with a thawing switch 121 for controlling the start or stop of the thawing process. The rf generation module 130 may be configured to start operating when the defrost switch 121 is turned on; when the defrosting switch 121 is turned off, the operation is stopped. During the thawing process, the user may terminate the thawing process by closing the thaw switch 121. The door 120 may further include a buzzer (not shown) for prompting a user that the object to be treated has been thawed. The buzzer can be configured to start working when the detection module 150 judges that the object to be processed is thawed (when the change rate of the dielectric coefficient of the object to be processed is reduced to be less than or equal to a second preset threshold); when the object to be processed is taken out of the thawing chamber 114, the operation is stopped. An infrared sensor may be disposed on an inner wall of the thawing chamber 114 to sense whether the object to be treated is placed in the thawing chamber 114.
Fig. 2 is a schematic cross-sectional view taken along a sectional line a-a in fig. 1. Referring to fig. 1 and 2, the drum 110 may further include a vertical partition 111 and a horizontal partition 112 for defining an inner space of the drum 110. The vertical partition 111 may be provided to extend from a top plate of the cylinder 110 to a bottom plate of the cylinder 110 in a vertical direction. The rf generation module 130 may be disposed between the vertical partition 111 and the rear plate of the cylinder 110. The horizontal partition 112 may be provided to extend forward from the vertical partition 111 in the horizontal direction. The detection module 150 and the load compensation module 160 may be disposed between the horizontal partition 112 and the top plate of the cylinder 110.
The thawing chamber 114 may be enclosed by a vertical partition 111, a horizontal partition 112, and a bottom plate and two lateral side plates of the drum 110. The upper electrode plate 140a may be disposed on a lower surface of the horizontal partition 112, and the lower electrode plate 140b may be disposed on an upper surface of the bottom plate of the cylinder 110. The barrel 110 may further include a baffle 113 extending vertically upward from the front side end of the horizontal partition 112 to the top plate of the barrel 110 to prevent the detection module 150 and the load compensation module 160 from being exposed and to reduce the aesthetic appearance of the thawing apparatus 100. In other embodiments, the horizontal partition 112 may be disposed to extend forward from the rear plate of the cylinder 110 in the horizontal direction, and the vertical partition 111 may be disposed to extend from the horizontal partition 112 to the bottom plate of the cylinder 110 in the vertical direction, according to the actual situation (the size of the rf generation module 130 and the detection module 150, and the load compensation module 160).
The vertical partition 111 may be opened with a first wire through port 1112, so that the rf generation module 130 is electrically connected to the upper electrode plate 140a through the first wire through port 1112. The rear plate of the cylinder 110 may be formed with a second wire port 116, so that the input terminal 131 is electrically connected to the rf generation module 130 through the second wire port 116.
The thawing apparatus 100 may further comprise a power supply module 242, such as a voltage converter, for providing a suitable voltage to the rf generation module 130. In some embodiments, the power supply module 242 may be disposed in series between the input terminal 131 and the rf generation module 130. In this embodiment, the power supply module 242 may be disposed between the cylinder 110 and the vertical partition 111. In other embodiments, the power supply module 242 may be disposed in series between the external power source and the input terminal 131.
In some embodiments, the rear plate of the drum 110 may be formed with a device inlet 115, and the vertical partition 111 at the rear side of the thawing chamber 114 may be formed with a thawing inlet 1111, so that air outside the thawing device 100 enters the thawing chamber 114 of the thawing device 100 through the device inlet 115 and the thawing inlet 1111. The lateral plates of the barrel 110 may be provided with device outlets 118, so that the gas in the thawing chamber 114 can be discharged out of the thawing device 100 through the device outlets 118.
In some preferred embodiments, the device air inlet 115 and the thawing air inlet 1111 of the thawing device 100 may be respectively disposed at both lateral sides of the rf generation module 130 to facilitate heat dissipation of the rf generation module 130. In some alternative embodiments, the device intake vent 115 and the thaw intake vent 1111 of the thawing device 100 may be disposed on the same side of the rf generation module 130.
According to the invention, the device air inlet 115 and the device air outlet 118 are arranged on the unfreezing device 100, so that the unfreezing chamber 114 can be used for placing food materials when a unfreezing instruction is not received, and the storage space in the unfreezing device 100 is fully utilized.
The thawing apparatus 100 may further comprise a tray 170. A tray 170 is disposed in the thawing chamber 114, and the object to be processed is placed on the tray 170. The tray 170 may be configured to be controllably moved in the depth direction of the thawing chamber 114 to facilitate placement and removal of the item to be treated. In some preferred embodiments, the distance between the lower surface of the tray 170 and the lower electrode plate 140b may be 8-12 mm, such as 8mm, 10mm, 12mm, to prevent friction with the lower electrode plate 140b during the drawing of the tray 170.
Fig. 3 is a schematic configuration view of the thawing apparatus of fig. 1, in which an apparatus door 120 of the thawing apparatus 100 is removed to show an internal structure of the thawing apparatus 100. Referring to fig. 3, the drum 110 and the apparatus door 120 may be provided with electromagnetic shielding features 117, respectively. The electromagnetic shielding feature 117 disposed on the barrel 110 and the electromagnetic shielding feature 117 disposed on the device door 120 can be electrically connected to reduce the amount of outward magnetic leakage of the thawing device 100 when the device door 120 is closed. The electromagnetic shielding feature 117 may be a conductive coating applied to the inner wall of the cylinder 110 and the inner surface (surface facing the cylinder 110) of the door assembly 120, a conductive metal mesh attached to the inner wall of the cylinder 110 and the inner surface of the door assembly 120, or a conductive metal mesh formed among the respective plate bodies surrounding the cylinder 110 and in the door assembly 120, etc.
In some preferred embodiments, the thawing apparatus 100 may further comprise an elastic conductive loop 180. The elastic conductive ring 180 may be disposed at a periphery of the front opening of the thawing chamber 114, so that the elastic conductive ring 180 may be pressed and deformed when the door 120 is closed, and tightly attached to the door 120, i.e., a seal is formed between the elastic conductive ring 180 and the door 120. The electromagnetic shielding feature 117 disposed on the barrel 110 and the electromagnetic shielding feature 117 disposed on the device door 120 may be disposed in conductive contact with the elastic conductive ring 180, respectively, so as to reduce the amount of outward magnetic leakage of the thawing device 100 when the device door 120 is closed. In some preferred embodiments, the elastic conductive loop 180 may be made of silicone, silicone fluoride, EPDM, fluorocarbon-silicon fluoride, and silver-plated aluminum. The elastic conductive ring 180 may have a hollow ring structure, so that it can be tightly attached to the door 120 when the door 120 is closed. The width of the elastic conductive ring 180 may be 20-30 mm, such as 20mm, 25mm or 30mm, to improve the sealing performance of the thawing apparatus 100. In some preferred embodiments, the device intake vent 115, the thawing intake vent 1111, and the device exhaust vent 118 of the thawing apparatus 100 may each be provided with a conductive metal mesh 190, and the conductive metal mesh 190 may be provided in conductive connection with the electromagnetic shielding feature 117 provided to the barrel 110 to reduce the amount of magnetic leakage of the thawing apparatus 100.
Particularly, in the present invention, the frequency of the rf signal (i.e. the electromagnetic wave for thawing the object to be treated) generated by the rf generating module 130 may be 40-42 MHz, such as 40MHz, 40.48MHz, 40.68MHz, 41MHz or 42MHz, so as to reduce the thawing time of the object to be treated, improve the temperature uniformity of the object to be treated and reduce the juice loss rate thereof. In a preferred embodiment, the frequency of the RF wave can be a predetermined fixed frequency within a range of 40.48-40.68 MHz, so as to further reduce the thawing time of the object to be treated, improve the temperature uniformity of the object to be treated and reduce the juice loss rate thereof. Among them, when the frequency of the radio frequency wave is 40.68MHz, the thawing effect is best.
For a further understanding of the present invention, preferred embodiments of the present invention are described below with reference to more specific examples, but the present invention is not limited to these examples.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | |
| Frequency (MHz) | 40 | 40.48 | 40.68 | 41 | 42 | 13.56 | 27.12 |
In the thawing apparatus 100 respectively provided with the rf frequencies of the above-described embodiments 1 to 5 and comparative examples 1 to 2, the power of the rf wave is 100W, and the structure and the operation flow of the thawing apparatus 100 are the same.
The thawing apparatus 100 provided with the frequencies of the respective embodiments and the respective comparative examples was subjected to a thawing effect test. Description of the test: 1kg of beef with the same shape and specification and an initial temperature of-18 ℃ is selected and placed on the tray 170 in the thawing apparatus 100 of each embodiment and each proportion respectively, and the thawing time, the temperature uniformity and the juice loss rate of each embodiment and each proportion are measured respectively. Wherein the thawing time is the time from the beginning of thawing to the time when the thawing apparatus 100 judges that the thawing is completed (i.e. the rf generation module 130 stops working); temperature uniformity: after thawing, respectively measuring the temperatures of four corners and a central point of the beef, and calculating the difference value between the temperature of the central point and the average value of the four corners, wherein the temperature uniformity is the ratio of the difference value to the average value; juice loss rate: and respectively measuring the weight of the beef before thawing and the weight of the beef after thawing, and calculating the difference between the two weights, wherein the juice loss rate is the ratio of the difference to the weight of the beef before thawing.
The results of the thawing effect test according to examples 1 to 7 and according to comparative examples 1 to 2 are shown in table 2.
TABLE 2
| Thawing time (min) | Temperature uniformity | Juice loss (%) | |
| Example 1 | 19 | 0.4 | 0.35 |
| Example 2 | 18 | 0.4 | 0.32 |
| Example 3 | 18 | 0.3 | 0.29 |
| Example 4 | 19 | 0.5 | 0.35 |
| Example 5 | 20 | 0.5 | 0.40 |
| Comparative example 1 | 25 | 0.6 | 0.35 |
| Comparative example 2 | 23 | 0.6 | 0.40 |
According to the test results of the example 5 and the comparative example 1 in table 2, under the same power of the rf wave and the same structure of the thawing apparatus 100 and the same work flow, the thawing apparatus 100 using the rf frequency within the range of the embodiment of the present invention has better thawing effect than the thawing apparatus 100 using the rf frequency in the prior art under the same test conditions, the former has a 20% shorter thawing time and the temperature uniformity has an improved 17% compared to the latter.
As can be seen from the test results of examples 1 to 5 in table 2, the thawing time of the thawing apparatus 100 according to the embodiments of the present invention is 20min or less, the temperature uniformity is 0.5 or less, and the juice loss rate is 0.40% or less. By further optimizing the frequency of the radio frequency (for example, the radio frequency is 40.48 to 40.68MHz), the thawing time of the thawing apparatus 100 can be reduced to less than 18min, the temperature uniformity can be improved to less than 0.4, and the juice loss rate can be reduced to less than 0.32%.
The present invention may also provide a refrigerator 10 based on the thawing apparatus 100 of any of the foregoing embodiments. Fig. 5 is a schematic structural view of the refrigerator 10 according to an embodiment of the present invention, in which all external door bodies of the refrigerator 10 are removed to show a compartment structure inside the cabinet 200 of the refrigerator 10; fig. 6 is a schematic sectional view of the refrigerator 10 shown in fig. 5. Referring to fig. 1, 5 and 6, the refrigerator 10 may generally include a cabinet 200 defining at least one receiving space, compartment doors for respectively opening and closing access ports of the respective receiving spaces, and a thawing apparatus 100 provided in one receiving space. The receiving space in which the thawing apparatus 100 is provided may be provided with an output terminal 245. The input terminals 131 may be configured to interface with the output terminals 245 to provide power to the thawing apparatus 100. In the illustrated embodiment, the number of thawing devices 100 is one. The number of the accommodating spaces of the refrigerator 10 may be three, and the three accommodating spaces are respectively a refrigerating chamber 210, a variable temperature chamber 220, and a freezing chamber 230, and a refrigerating door body 211, a variable temperature door body 221, and a freezing door body 231 for opening and closing the refrigerating chamber 210, the variable temperature chamber 220, and the freezing chamber 230, respectively, and the thawing device 100 is disposed in the variable temperature chamber 220. The thawing apparatus 100 can be fixed in the temperature-changing compartment 220 by interference fit or snap-fit with the inner walls of the two vertical sides of the temperature-changing compartment 220.
In addition, as well known to those skilled in the art, the refrigerating compartment 210 is a storage compartment for preserving food materials at a preservation temperature of 0 to +8 ℃; the freezing chamber 230 is a storage chamber with the preservation temperature of food materials of-20 to-15 ℃; the temperature-changing chamber 220 is a storage chamber capable of changing the storage temperature in a wide range (for example, the adjustment range can be above 4 ℃ and can be adjusted to above 0 ℃ or below 0 ℃), and the storage temperature can generally span the refrigeration temperature, the soft freezing temperature (generally-4 to 0 ℃) and the freezing temperature, and is preferably-16 to +4 ℃.
The rear plate of the barrel 110 may be spaced from the rear wall of the temperature change compartment 220 to facilitate the entry of air in the temperature change compartment 220 into the thawing apparatus 100. The lateral plates at two lateral sides of the cylinder 110 may have a gap with the lateral walls at two lateral sides of the temperature-changing chamber 220, so that the gas in the thawing apparatus 100 is discharged into the temperature-changing chamber 220. When the refrigerator 10 is a direct-cooling refrigerator, the rear wall of the temperature-changing chamber 220 is the rear wall of the inner container thereof; when the refrigerator 10 is an air-cooled refrigerator, the rear wall of the temperature-varying chamber 220 is the front surface of the cover plate of the inner air duct. In some preferred embodiments, the distance between the rear plate and the lateral side plates of the barrel 110 and the rear wall and the lateral side walls of the temperature-varying chamber 220 can be 2-3 mm, such as 2mm, 2.5mm or 3mm, so as to ensure that the thawing chamber 114 has a larger effective volume while ensuring that the thawing apparatus 100 has a proper air intake and air output.
In some embodiments, the refrigerator 10 according to the present invention may be an air-cooled refrigerator, and the temperature-varying compartment 220 may include an air duct cover. The air duct cover plate and the rear wall of the liner of the temperature-varying chamber 220 are clamped to form a temperature-varying air duct, and the air duct cover plate is provided with a temperature-varying air inlet for providing cold energy for the temperature-varying chamber 220.
In some preferred embodiments, the device inlet 115 and the temperature change inlet of the thawing device 100 may be connected by a connection tube to facilitate refrigeration of the thawing chamber 114 of the thawing device 100. In other preferred embodiments, the projection of the device air inlet 115 of the thawing device 100 in the thickness direction of the rear plate of the cylinder 110 can be located in the temperature-variable air inlet so as to refrigerate the thawing chamber 114 of the thawing device 100.
In some preferred embodiments, the refrigeration system of the refrigerator 10 may be configured to stop providing the cooling capacity to the accommodation space where the thawing apparatus 100 is provided, when the thawing switch 121 is turned on; when the thawing switch 121 is turned off, the original refrigeration program of the refrigerator 10 is operated to reduce the influence of the refrigeration system of the refrigerator 10 on the temperature of the thawing chamber 114 when the thawing apparatus 100 thaws the treatment object. Wherein the refrigeration system of the refrigerator 10 may include a compressor, a condenser, a capillary tube, and an evaporator for providing refrigeration.
Fig. 7 is a schematic structural view of the compressor room 240 in fig. 6. Referring to fig. 7, the cabinet 200 of the refrigerator 10 further defines a compressor chamber 240. The compressor chamber 240 may include a main control panel 243 for controlling the operation of the refrigerator 10, a compressor 241, a condensed water collecting structure 244, and an external power line (not shown) for supplying power for the operation of the refrigerator 10, which are sequentially disposed. In embodiments where the power module 242 is connected in series between the external power source and the input terminal 131 of the thawing apparatus 100, the power module 242 may be disposed within the compressor compartment 240 of the refrigerator 10 to facilitate heat dissipation and maintenance of the power module 242. The power supply module 242 may be fixed to an upper wall of the compressor compartment 240 so as to be electrically connected with the output terminal 245 provided in the receiving space. In some embodiments, the power supply module 242 may be a DCDC converter. The DCDC converter may be provided to be electrically connected with the main control board 243 to supply power to the thawing apparatus 100. The DCDC converter may be disposed between the main control board 243 and the compressor 241 to facilitate electrical connection with the main control board 243. In other embodiments, the power module 242 may be an ACDC converter. The ACDC converter may be configured to electrically connect to an external power source of the refrigerator 10. As will be appreciated by those skilled in the art, the defrosting apparatus 100 may be connected to the control circuit of the refrigerator 10 through input and output terminals.
Fig. 8 is a detailed flowchart of a thawing method for the refrigerator 10 according to an embodiment of the present invention. Referring to fig. 8, the thawing method of the refrigerator 10 of the present invention may include the steps of:
step S802: judging whether the unfreezing switch 121 is turned on, if so, executing step S804; if not, go to step S802.
Step S804: the power supply module 242 starts operating.
Step S806: judging whether the device door body 120 is closed, if so, executing step S808; if not, go to step S806. In this step, the open/close state of the door 120 may be detected by the door opening detection device. The door opening detection device can detect by using a fan-shaped switch, a magnetic sensitive switch, a hall switch and other modes, and generates different electric signals when the device door body 120 is completely closed or opened so as to indicate the state of the device door body 120.
Step S808: the refrigeration system stops providing cold energy for the accommodating space provided with the thawing device 100, the radio frequency generation module 130 generates a radio frequency signal of 40-42 MHz, and the detection module 150 detects an incident wave signal and a reflected wave signal of an electrical connection line connecting the radio frequency generation module 130 and the upper electrode plate 140 a. Step S810 and step S811 are performed. In this step, the thawing apparatus 100 is disposed in the temperature-varying compartment 120, and the rf generation module 130 generates an rf signal of 40.68 MHz.
Step S810: and acquiring the voltage and the current of the incident wave signal and the voltage and the current of the reflected wave signal, and calculating the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed.
Step S812: judging whether the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed is larger than or equal to a first rate threshold value, if so, executing a step S814; if not, go to step S810.
Step S814: the working power of the rf generation module 130 is reduced by 30-40%. In this step, the operating power of the rf generation module 130 may be reduced by 35%.
Step S816: and acquiring the voltage and the current of the incident wave signal and the voltage and the current of the reflected wave signal, and calculating the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed.
Step S818: judging whether the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed is less than or equal to a second rate threshold value, if so, executing a step S820; if not, go to step S816.
Step S820: the power supply module 242 stops operating, the defrost switch 121 is reset (i.e., turned off), the original refrigeration program of the refrigerator 10 is run, and the buzzer starts operating.
Step S822: judging whether the object to be processed is taken out from the unfreezing chamber 114, if so, executing step S824; if not; step S822 is performed.
Step S824: the buzzer stops working.
Step S811: obtaining the voltage and current of the incident wave signal and the voltage and current of the reflected wave signal, and calculating the load impedance Z of the RF generation module 1302。
Step S813: determining the load impedance Z of the RF generating module 1302And an output impedance Z1If the difference is smaller than the first impedance threshold, execute step S815; if not, go to step S817.
Step S815: the motor of the load compensation module 160 operates to increase the impedance of the compensation unit. The process returns to step S811.
Step S817: determining the load impedance Z of the RF generating module 1302And an output impedance Z1If the difference is greater than the second impedance threshold, execute step S819; if not, go to step S811.
Step S819: the motor of the load compensation module 160 operates to reduce the impedance of the compensation unit. The process returns to step S811.
As will be understood by those skilled in the art, when the program proceeds to step S820, the power supply module 242 stops operating, i.e., stops supplying power, the rf generation module 130, the detection module 150 and the load compensation module 160 all stop operating, i.e., when the change rate Δ ∈/Δ t of the dielectric constant of the object to be processed decreases to be equal to or less than the second rate threshold, the detection module 150 stops detecting the incident wave signal and the reflected wave signal of the electrical connection line connecting the rf generation module 130 and the upper electrode plate 140a, and the load compensation module 160 stops operating.
Hair brushA defrosting workflow of the refrigerator 10 of an embodiment may include: when the user opens the defrosting switch 121 and the door 120 of the device is closed, the power supply module 242 starts to supply power, the refrigeration system of the refrigerator 10 stops supplying cold energy to the accommodating space provided with the defrosting device 100, the radio frequency generation module 130 generates a radio frequency signal of 40.68MHz, and the detection module 150 and the load compensation module 160 start to work. The detection module 150 detects an incident wave signal and a reflected wave signal of an electrical connection line connecting the rf generation module 130 and the upper electrode plate, and calculates a load impedance Z of the rf transmitter 1302And the rate of change of the dielectric constant Δ ε/Δ t. When the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed is larger than or equal to the first rate threshold, the working power of the radio frequency generation module 130 is reduced by 35 percent, and simultaneously, in the whole defrosting work flow, when the load impedance Z of the radio frequency generation module 130 is2And an output impedance Z1When the difference is smaller than the first impedance threshold or larger than the second impedance threshold, the load compensation module 160 adjusts the impedance of the compensation unit through the motor, so as to adjust the load impedance Z of the rf generation module 1302Make the load impedance Z of the RF generation module 1302And an output impedance Z1The difference is always greater than or equal to the first impedance threshold and less than or equal to the second preset threshold. When the change rate delta epsilon/delta t of the dielectric coefficient of the object to be processed is smaller than or equal to the second rate threshold, the power supply module 242 stops supplying power, the original refrigeration program of the refrigerator 10 is operated, the radio frequency generation module 130, the detection module 150 and the load compensation module 160 stop working, and the buzzer starts working. When the user takes out the object to be processed from the thawing chamber 114, the buzzer stops operating.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (9)
1. A thawing apparatus, comprising:
a barrel defining a thawing chamber therein having a forward opening for placing an object to be treated;
the device door body is arranged at the front opening of the unfreezing chamber and used for opening and closing the unfreezing chamber;
a radio frequency generation module configured to generate a radio frequency signal;
the upper electrode plate and the lower electrode plate are respectively horizontally arranged on the top wall and the bottom wall of the unfreezing chamber and are respectively electrically connected with the radio frequency generating module so as to generate radio frequency waves with corresponding frequencies in the unfreezing chamber according to the radio frequency signals and unfreeze the object to be processed in the unfreezing chamber; and
an input terminal configured to be electrically connected to the radio frequency generation module to receive external electric power; wherein
The unfreezing device is configured to judge the unfreezing progress of the object to be treated according to the change rate of the dielectric coefficient of the object to be treated; and the thawing apparatus further comprises:
the load compensation module is configured to controllably increase or decrease the load impedance of the radio frequency generation module and enable the difference between the load impedance and the output impedance of the radio frequency generation module to be greater than or equal to a first impedance threshold value and less than or equal to a second impedance threshold value so as to improve the thawing efficiency of the object to be treated.
2. The thawing apparatus of claim 1, further comprising:
and the detection module is configured to detect an incident wave signal and a reflected wave signal of an electrical connection line connecting the radio frequency generation module and the upper electrode plate, calculate the load impedance according to the voltage and the current of the incident wave signal and the voltage and the current of the reflected wave signal, and calculate the change rate according to the load impedance.
3. The thawing apparatus of claim 2, wherein said barrel further comprises:
the radio frequency generation module is arranged between the vertical partition plate and the rear plate of the barrel; and
the horizontal partition plate is arranged to extend forwards from the vertical partition plate along the horizontal direction, and the detection module and the load compensation module are arranged between the horizontal partition plate and the top plate of the cylinder.
4. The thawing apparatus of claim 3, wherein
The rear plate of the cylinder body is provided with a device air inlet, and the vertical partition plate is provided with a thawing air inlet, so that air outside the thawing device enters the thawing chamber through the device air inlet and the thawing air inlet; and is
And the side plates at the two transverse sides of the unfreezing cavity are provided with device air outlets, so that the gas in the unfreezing cavity is discharged out of the unfreezing device through the device air outlets.
5. The thawing apparatus of claim 1, wherein said radio frequency generation module is configured to:
when the change rate of the dielectric coefficient of the object to be treated is greater than or equal to a first rate threshold value, the working power of the object to be treated is reduced by 30-40% so as to prevent the object to be treated from being excessively thawed; and/or
And stopping working when the change rate of the dielectric coefficient of the object to be processed is reduced to be less than or equal to a second rate threshold value.
6. The thawing apparatus of claim 1, further comprising:
the unfreezing switch is arranged on the device door body and is used for controlling the starting and stopping of a unfreezing program; and the radio frequency generation module is configured to:
when the unfreezing switch is turned on, the work is started;
and when the defrosting switch is closed, the defrosting switch stops working.
7. The thawing apparatus of claim 1, wherein
The cylinder body and the device door body are respectively provided with electromagnetic shielding characteristics; and is
The electromagnetic shielding characteristic of the cylinder and the electromagnetic shielding characteristic of the door body of the device are set to be in conductive contact, so that when the door body of the device is closed, the radio frequency waves generated by the unfreezing device are prevented from leaking outside the unfreezing device.
8. The thawing apparatus of claim 1, wherein
The radio frequency signal is a fixed frequency preset in the range of 40-42 MHz.
9. A refrigerator comprising a cabinet defining at least one accommodating space, compartment doors for opening and closing the at least one accommodating space, respectively, and a thawing apparatus according to any one of claims 1 to 8, the thawing apparatus being provided in one of the accommodating spaces; wherein
The containing space provided with the thawing device is provided with an output terminal, and the input terminal is arranged to be in butt joint with the output terminal so as to supply power to the thawing device.
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| US11484048B2 (en) | 2018-09-14 | 2022-11-01 | Nxp Usa, Inc. | Defrosting apparatus with defrosting operation monitoring and methods of operation thereof |
| US11723121B2 (en) * | 2018-09-14 | 2023-08-08 | Nxp Usa, Inc. | Defrosting apparatus with low-loss load detection and methods of operation thereof |
| CN111317017B (en) * | 2018-12-14 | 2023-06-20 | 青岛海尔智能技术研发有限公司 | Radio frequency thawing apparatus |
| CN209893774U (en) * | 2019-01-04 | 2020-01-03 | 青岛海尔股份有限公司 | Refrigerating and freezing device |
| CN111227024A (en) * | 2020-03-04 | 2020-06-05 | 珠海格力电器股份有限公司 | Thawing device and refrigerator |
| CN114521033A (en) * | 2020-11-20 | 2022-05-20 | 青岛海尔特种电冰箱有限公司 | Control method for heating device and heating device |
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| CN202836051U (en) * | 2012-09-21 | 2013-03-27 | 合肥晶弘电器有限公司 | Refrigerator main control panel mounting box |
| CN106288626A (en) * | 2016-08-29 | 2017-01-04 | 合肥华凌股份有限公司 | A kind of thawing apparatus, refrigerator and unfreezing control method thereof |
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| US7891205B2 (en) * | 2007-05-17 | 2011-02-22 | Electrolux Home Products, Inc. | Refrigerator defrosting and chilling compartment |
| US11284742B2 (en) * | 2015-09-01 | 2022-03-29 | Illinois Tool Works, Inc. | Multi-functional RF capacitive heating food preparation device |
| KR102414251B1 (en) * | 2015-10-13 | 2022-06-29 | 삼성전자주식회사 | Cooking apparatus and control method thereof |
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| CN202836051U (en) * | 2012-09-21 | 2013-03-27 | 合肥晶弘电器有限公司 | Refrigerator main control panel mounting box |
| CN106288626A (en) * | 2016-08-29 | 2017-01-04 | 合肥华凌股份有限公司 | A kind of thawing apparatus, refrigerator and unfreezing control method thereof |
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Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: Qingdao Haier Joint Stock Co.,Ltd. |